Finally I have opportunity to know the answer. If you follow my early blog, I bought the Sony Digital Recorder for > 1 year ago. I hardly use it. Last 2 months, I have given the opportunity to record the natural birds sound at night from 11pm to 12am at a very successful birds house. The internal sound is off during the recording.
Below are the sound waveform from 11pm to 12am. If you look at the waveform, most of the time the birds are very active. A lot of "chit chat chit chat...." and "tek tek tek...." sounds. Only when it close to 12am, the sound start to soften down. As the birds are very active, hardly hear any Piyik sound.
My friend told me at that time, most of the nests contains egg. I will ask my friend to record again when there is more baby birds.
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